Question

\i spend my day studying the physics of batteries to make them last longer in phones and electric vehicles. which branch do i work in?\

Explanation:

Physical chemistry focuses on the physical properties and behavior of chemical systems. Studying the physics of batteries (which involves understanding energy transfer, reaction kinetics, etc., at a physical - chemical level) to improve their performance in phones and electric vehicles aligns with the scope of physical chemistry. Analytical chemistry is about separation, identification, and quantification of matter. Biochemistry is related to chemical processes in living organisms. Organic chemistry deals with carbon - containing compounds. Inorganic chemistry is about inorganic compounds. Theoretical chemistry is more about developing models and theories rather than practical applications like battery performance in devices.

Answer:

Physical Chemistry